2011, March 17.Messenger, an interplanetary spacecraft built at The Johns Hopkins University Applied Physics Lab in Laurel, became the first satellite to orbit the planet Mercury.

2012, May 18-19. Annual G8 Summit held at Camp David, Frederick County. The Group of 8 (G8) included the United States, the United Kingdom, Germany, Japan, Italy, Canada, and Russia. The European Union also participated.

2014, June 16. Chesapeake Bay Watershed Agreement to restore and protect the Bay, its tributaries, and the surrounding lands signed by Delaware, Maryland, New York, Pennsylvania, Virginia, West Virginia, the District of Columbia, the Chesapeake Bay Commission, and the U.S. Environmental Protection Agency (EPA).

2014, Sept. 10-16. Star-Spangled Spectacular, a festival of tall ships and naval vessels from around the world commemorating 200th anniversary of National Anthem, held in Baltimore

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